Joint for pipes.



UNITED srArEs 'PATENT oEEroE.

No. sienes.

Specification of Letters Patent. I

Patented March 27, 1906.

Application .filed December 14, 1903. Serial No. 185,070.

To .all whom it 11m/y concern."

Be it known that I, MARK DEAN, a citizen of the United States, and aresident of East Orange, county of Essex, State of New Jersey, have invented certain new and useful Imrovements in Joints for Pipes, of which the ollowing is a specification.

The o ground work and in plumbing generally, where it is desirable to allow for variations from the straight line in which the pipes. are set..

Sometimes from the'naturc of the walls in which the pipes are set it is desirable tdinake i a slight variation from a straight line in a continuous stretch of piping; but my invention has more particularly in view the protection l of the joint against leakage where the variation or deflection is caused by underground settling. To this end I construct successive lengths of pipe, sotliat each joint is formed by the meeting of'an external taperon the .end of one pipe and aninternal taper on the' `end of the other pipe.v In order to make a joint of this character a perfect joint which will stand many hundred-pounds of pressure both in an absolutely strai ht or continuous position and 'when one of t e pipes is somewhat defiected from the longitudinal, axis of the other, I have found that the external ta- Aper should be somewhat'larger in circumference than the internal and vthat the pitch should be slightlygreater in the internal ta'- per than the external taper. It is also an advantage when cast-iron pipe is employed to have the taperedy surfaces inachined,as also the'jshoulders adjacent to the taper on both ends of piping, as thereby a clean-cut surface is always available to effect a joint.

One form of my invention is shown accompanying drawings, in which- Figure 1 isa longitudinal view, partly in I l section, of two pi es s et in strict alineinent with each other.

- two pi es being" soinewhat .deflected from each ot er.

' Same letters indicate similar partsiin both l the figures.

A'is a length of pipefprovided with a nuin' ber of projecting lu s a, preferably two in number, nearthe en of the pipe and terminating in a'slight tapering edge b beyond the lugs. B is another pipe end provided with ject of my invention is to provide a new joint for pipes; and more particularly for cast-iron pipes, such as are usedinunden.

ig. 2 is a similar view, thel l similar lugs c. The end of the pipe has a recess d, the sides of which taper slightly and with an annular shoulder c. rl`he lugs a a are provided with bolt-holesf, by which the two pipe ends may be secured together by the bolts g.,

The external tapering surface of the pipe A is slightly larger in circumference than the internal tapering-surface of the pipe B, so

in direct alinemcnt by the' bolts g complete lowing the lextreme edge of the pipe A to the pipe B. The pitch of the recess is slightly greater than that of the entering pipe A, so as to allowa small amount of play, which'is es` sential when a perfect joint has to be niade ment, as shown in Fig. 2. Both tapers should be straight, as shown, as ai'ounded surface interferes with a perfect joint.

It is desirable that both taperinor surfaces and also the annular shoulder of the extreme end of the )ipe A, and al small portion of the surface of1 the lugs should be machined, so that the angles made by the taper with the pipe-surface and the lug-surface should have sharp and true edges, so that wherever contact fis made by one of these edges on one pipe with one of the surfaces on the other a tight joint results.4

The opposed edges ofthe lugs n'nay be parallel, but are preferably of different angles, so as to allow rooin for the deflection-'of the pipe, although .under ordinary circumstances the fact that the lugs are` not drawn into contact with each other gives sufficient play.

MARK DEAN. Witnesses:

O.; W. MoCoNNELL, l W. I. PREBLE,J1.

come up against the bottom of the recess in4 with the pipes deflected from direct alinethat when'the pipe ends are drawn together" and effective contact takes place without altIie recess,

Although described as applied to a pipe 

